BBC News
US President Barack Obama has spoken by phone to Iran's Hassan Rouhani - the first such top-level conversation in more than 30 years.
Mr Obama spoke of a "unique opportunity" to make progress with Iran's new leadership, amid a flurry of diplomacy over its nuclear programme.
Earlier, Mr Rouhani said Iran was keen to reach a deal soon.
He also asserted that Iran did not seek a nuclear bo...